Inserted joist ceiling



J. HARTMANN.

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APPLICATION FILED AUG-29, 192l- 1,414,332, Patehted Apr. '25, 1925.

UNITED STATES PATENT oFF-1c1:. f

.ioH NNEs HARTMANN, or oAssEL, GERMANY.

INsnRTEn JoIsr pnILIitG. 1'

Specification of Letters Patent.

Application filed August 29, 1921'. Serial No. 496,680.

T 0 all whom it may concern Be it known that I, JoHANNns I'IART- MANN, acitizen of the German Republic,

residing at Cassel, Germany, have invented certain new and usefulImprovements in Inserted Joist. Ceilings, (for which I have filedapplication in Germany August 26, 1920,) of which the following is aspecification.

In inserted ceilings of known construction a considerable quantity ofwood is used the expensive double reed fabric is eliminated altogether.v v

, lccording to this invention the lower surface'of the inserted ceilingis formed by a layer of longitudinally arranged rush placed crosswiseupon layers of straw, and

wires, fixed to the beams, serving to support this rush and strawlayers. The support-- mg wires are the slab boards. In order to stretchthe straw of the transverse layers also the ends of the straw are woundaround the laths which are parallel with the beams. The space up to theupper edge of the slabbing is filled with binding material.

A form of construction of the improved inserted ceiling is shown inperspective view by way of example in the single figure of theaccompanying drawing. The improved ceiling is constructed'in thefollowing manner; Between the beams a, 7) wires 0 are fixed which arespaced at convenient distances, and are bent to U- shape as can be seenfrom the drawing. These wires 0 serve as supports for the rushes (Zarranged inlongitudinal direction. The straw e is arranged paralleltothe wires 0 and held by laths 7 which are placed upon the straw in alongitudinal direction parallel with the beams a, b and fixed to saidbeams. I the straw are placed over the laths f and slab boards 9 areplaced between the wires 0 upon the laths for bridging over the spacefrom one lath to the other. The space be- 7 revented from bending by;means of longitudinal wires placed over,

The upwardly directed ends of low these boards I with loam admixed withstraw. I In order to prevent the fiexure of the Patented Apr. 25,1922. V

(/has been filledpreviously 6O wires 0 longitudinal stretching wireshare provided which are placed below the wires i '0 but over the slabboards Straw i which is arranged in a longitudinal"direction is bentinstead of going straight from g to .0.'

All the constructional parts are finally covered with a layer is of loamadmixed with straw, said layer reaching up to the upper edge of theboards g. I p

As in plasterworkstraw must be fixed by wires upon the lower surfaces ofthe beams, a, b, the horizontal part of the wires is arranged slightlybelow} the lower sur face of the beams so that a uniform layer offmortar can be applied. Upon the layer of' straw-loam a fillingof coke orthe'like' can be placed as usual. Instead of the strain loam a. mortarcomposedofi lime, sand and gypsum, or any other suitable bindingmaterial could be used.

The improved ceiling can bemade in much less time than is required forthe,

building of the inserted ceilings of usual construction and althoughmuch less wood and nails are used, the resistance of the ceiling isequal to that of the ceilings of known type. g i

I claim: An improved inserted joist ceiling comprising in combinationwith 't-he 1beams,

supporting wires leading from beam to beam, slab boards upon the beams,longi--. tudinal wires under said cross wires of thebeams designed toprevent the bend-- ing of the cross wires and being guided over the saidslab boards, a layer of longitudinally arranged .rush and oftransversely arranged straw upon said supporting wires,

longitudinal" laths placed upon the straw layer and nailed to the beamsthe endsofthe cross layer of-straw being bent over 3 said laths, afilling of strawloam upon said layer of straw, an upper layer of strawupon said filling, said straw being bent oversaid slab boards and afinal filling ofconvenient" binding material reaching up to the upperedge of said slab boards.

In testimony whereof I affix my signature in presence of two witnesses.

'- JOHANNES HARTMANN.

Witnesses:

' W. SMITH,

. FERD Bi'j'r'rienk.

